Android 动态申请权限的两种方式

第一种：

//申请权限
if (Build.VERSION.SDK_INT >= 23) {
int REQUEST_CODE_CONTACT = 101;
String[] permissions = {Manifest.permission.READ_EXTERNAL_STORAGE,
Manifest.permission.WRITE_EXTERNAL_STORAGE,
Manifest.permission.MOUNT_UNMOUNT_FILESYSTEMS};
//验证是否许可权限
for (String str : permissions) {
if (this.checkSelfPermission(str) != PackageManager.PERMISSION_GRANTED) {
//申请权限
this.requestPermissions(permissions, REQUEST_CODE_CONTACT);
}
}
} 
第二种：

String[] permissions = new String[]{Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE};
List<String> mPermissionList = new ArrayList<>();

// private ImageView welcomeImg = null;
private static final int PERMISSION_REQUEST = 1;
// 检查权限

private void checkPermission() {
mPermissionList.clear();

//判断哪些权限未授予
for (int i = 0; i < permissions.length; i++) {
if (ContextCompat.checkSelfPermission(this, permissions[i]) != PackageManager.PERMISSION_GRANTED) {
mPermissionList.add(permissions[i]);
}
}
/**
* 判断是否为空
*/
if (mPermissionList.isEmpty()) {//未授予的权限为空，表示都授予了

} else {//请求权限方法
String[] permissions = mPermissionList.toArray(new String[mPermissionList.size()]);//将List转为数组
ActivityCompat.requestPermissions(MainActivity.this, permissions, PERMISSION_REQUEST);
}
}

/**
* 响应授权
* 这里不管用户是否拒绝，都进入首页，不再重复申请权限
*/
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
switch (requestCode) {
case PERMISSION_REQUEST:

break;
default:
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
break;
}
} 
调用：

public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";

@Override
protected void onCreate(Bundle savedInstanceState) {
checkPermission();
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}

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原文链接：https://blog.csdn.net/qq_31939617/article/details/108244616